Question

Cos 33pi/65 cos49pi/65 cos57pi/65.cos61pi/65 cos63pi/65 cos64pi/65 is equal to what?

Answer 1

Answer:

We know the formula for calculating the area of a circle is  

A

=

π

⋅

r

2

where  

r

is the radius.

Substituting what we know:

64

π

c

m

2

=

π

r

2

we solve for  

r

64

π

c

m

2

π

=

π

r

2

π

64

c

m

2

=

r

2

√

64

c

m

2

=

√

r

2

r

=

8

c

m

Step-by-step explanation: